Brake assembly for presses



Feb. 5, 1952 P. H. DANLY ETAL BRAKE ASSEMBLY EoR PRESSES 2 SHEETS- SHEET 1 Filed March 19, 1949 Nn N\ vn mm Y M l@ f d m ww W/ NRS Y NQ w om vw m .--,Mlw. um www., f O E 14|- wm O9\\ f Oh mx .wmv

vw m v/ RS uw .Sm mnh, Wm VQLU Q Nw Ow En Nm WN Feb. 5, 1952 Filed March 19, l9f19 P. H. DANLY ETAL BRAKE ASSEMBLY FOR PRESSES 2 SHEETS-SHEET 2 5/L EOEGEFF BYL/ 12M/H1 L H TTOENE Y Patented Feb. 5, 1952 UNITED STATES PATENT OFFICE BRAKE ASSEMBLY FOR PRESSES Application March 19, 1949, SerialNo. 82,422

released by fluid pressure against the actionthereof.

This application is an improvement over our copending application, Serial No. 783,745, iiled November 3, 1947.

In most brake assemblies of thevprior art the l working parts of the brake normally rotate rwhen the clutch is in connected position. A brake disk secured to a stationary Apart of the assembly is adapted to be grabbed by thebrake parts Whenever the brake is set. The additional energy consumed in bringing the heavy parts up to speed is then dissipated in the form of heat in stopping their rotation by means of the brake. It is common practice in power presses to employ a continuously running motor driving a flywheel which is adapted to be clutched to and unclutched from the gear train driving an eccentric or crank. The arrangement is such that the ram and associated drive are brought to rest and immobilized by a brake when the drive is unclutched from the flywheel. Since large amounts of energy must be handled the friction involved, especially in large presses, is high. This friction stops the press when the clutch is disengaged and the brake set. In the construction shown in our copending application, Serial No. 7 83,745, we have Shown a construction in which the heat caused by friction is adapted to be dissipated by continuously circulating air. We employ a brake construction having a pair of brake shoes mounted between a stationary brake plate and a movable brake plate. The stationary brake plate takes the form of a brake ring coacting with a circular brake shoe. The movable brake plate takesthe form, in our previous construction, of a ring adapted to engage a movable brake shoe. The brake shoes were provided with rounded bearing surfaces designed to permit the equalization of pressure in event of distortion of either of the brake rings.

We have found that with heavy pressures in the case of large presses there is a tendency for the brake rings which engage the brake shoes to dish, and that in such cases the structure becomes complicated when the parts are made heavy enough to withstand the pressures involved.

One object of our invention is to provide an improved brake assembly in which the mass of the brake parts which must be started and stopped is greatly reduced and of simplified construction.

` with a fluid pressure actuated means adapted 1 Claim. (Cl. 18S-170) Another object of our invention is to provide an improved assembly in which the brake parts are continuously cooled by circulated air and having a simplied construction.

Another object of our invention is to provide an improved brake assembly of simplified -construction in which the brake linings will automatically equalize their wear.

Another object of our invention is to provide av simple, sturdy and efficient construction for an improved brake assembly for power presses.

Other and further objects of our invention will appear from the following description.

In the accompanying drawings which form part of the instant specification and which are to be read in conjunction therewith, and in which like reference numerals are used to indicate like parts in the various views:

Figure l is a sectional elevation through a power press flywheel showingv the clutch assembly and a brake assembly embodying our invention.

Figure 2 is a multiquarter sectional view taken along the lines A--A, B-B, C-C and D-D of Figure l, the respective quarter sections being indicated generally in Figure 2 by the reference letters A, B, C and D.

In general, our invention contemplates the mounting of a brake disk upon a press shaft for rotation therewith. The working parts of the brake structure are mounted in a brake housing immobilized to the press frame in any appropriate manner so that it will always remain stationary. In this manner it is not necessary to start and stop the larger mass of the working parts of the brake structure since only the brake disk rotates when the brake is released. By this construction we are enabled to save the amounts of energy normally wasted in bringing the heavy masses which comprise the brake structure up to speed and then having to stop them The brake disk is provided with a plurality of openings in which we loosely position disks of lining material, the construction being such that the individual disks are free to rotate and equalize their wear. Then too, we provide a system of lubrication so that all the bearings may be easily lubricated. The iiywheel is provided with fan blades adapted to circulate air through air passages formed in the stationary brake structure and thus continuously cool it. rPhe brake housing.

is mounted adjacent the flywheel and is provided to release the brake against the action of a plurality of springs which normally urge the movable` brake plate to braking position by clamping the brake disk between a stationary brake plate and the movable brake plate. The springs in our improved construction are positioned centrally of the brake plate and thus avoid the tendency to dish it. Similarly, the springs thrust against the brake housing centrally thereof and we are thereby enabled to eliminate -the tendency to dish the brake housing. Furthermore, by positioning the springs centrally of the movable brake plate lnstead of adjacent its periphery as shown in our copending application we may employ a plurality of springs and thus distribute the thrust over a greater area and avoid local stresses which were the cause of dishing action.

More particularly, referring now to theA draw` ings, a ilywheel 4 is mounted on a pair 'of roller 1oearings 6 and 8 which are supported 'by 2a shaft Io which is rotatably mounted in a pair ,oi bearings I2 and I4. A pillow block I'a supported by press frame I'I carries bearing I2. A pillow blocl; t

is supported by the press trame J2e 'carries bearing gli. A 'clutch housing 2z is 'se-eures to the nywheei t for rotation therewith and includes a stationary clutch plate 2 6y anda mov-able clutch plate 25. An annular piston '2B 'adapted to 'be 'moved by a pressure Asets the oliiteh t'o clamp clutch disks between the Stationary 'Clutch 'plate 245 and Ythe movable clutch plate 26. The Vclutch disks are carried by a clutch member v'312 which is secured 'by Spiinjes 34 to the 'shaft in :for rotation theref with while permitting a 'small degree 'of axial movement. A `fluid nieu-fum under pressure Ifor the operation of 'the clutch i's ladapted to be introduced through the opening 436 cap member k33, when'oeit Hows 'through axial duct to formed in the shaft Iil, throng "cross duct 42 through pipe yto the 'annular cylinder '13 which 'the annular kpiston 23 is situated: Springs "iE'S serve to urge the movable clutch pla-te 2.?6 to releasing position when the fluid pressure b'e-hi-nd the Episton f28 is released. Centi'ifug'al fan buckets 5o foi-'med in the "clutch'housing 22 draw air vthrough cooling passages 52 vpirineo, in the 4clutch structure, there being openings A45ft formed in the clutch member 32 "to pe'imit the lpassag'e 'of air.

The brake lioirsirig is formed `rwith a main body portion 56 which Ais secured `to the 'press frame I? by Ileals of ,Stud 'bolts 5:8, A brake housing cover 6U is secured "to the housing` V5G by means or" stud vbolts '52. The interior lo 'f the brake housing '55 is formed with fa stationary brake pla-te 64. ffm 'annular movable 'brake :plate S6 Vis supported by Vi{plillal-ity of bolts 68 which are threade'dly 'secured to the movable brake plate 16%. The other ends of the bolts 68 Ypass through 'an annular 'piston Til. The bolts 68 are lodged Within bushings 12 extending Vbetween the annular pis- .tjon 'lllV land the movable brake plate Se. Nuts l draw the annular vpiston 'Hl to the right 'as viewed in Figure 1 andfthus 'clamp the bushings le between the 'annular piston 10 'and the movable brake plate 66. The annular `piston 110 is 'lodged within an annular cylinder 16. A plurality of springs i8 are positioned in complementary re- `entrant portions vformed in the brake housing cover S0 andr in the movable brake plate 16S. The

'arrangement is such that the springs will force the brake plate 66 to theright'as viewed in 'Figi ure 1 to clamp brake Vdisks 80`which 'are oarried bythe vbrake member 82 between the stationary brake plate 64 and y'the movable brake plate 66. Upon the introduction of air through opening '84 into the annular'cylinderl the lannular piston 1 0 isfmovedlto the lef'tas viewed 4vin vFigure v1 against ith'e ac'tio'n "of springs 18 to yre'- lease the brake disks 80. The brake member 82 is secured to the shaft I0 by splines 86 so that``V the brake member is constrained to rotate with the'shaft I0, but is free to move axially thereof through a short distance. It will be Lnoted that the brake cylinder 'IE is covered by a flexible ceiling diaphragm 15 and that the clutch cylinder 46 is covered with a flexible ceiling diaphragm t5. This permits the respective brake and clutch pistons to move under fluid pressure while maintaining `a pressure tight seal and eliminating the necessity of piston rings.

The brake housing body member is formed with a plurality of air passages 88. Openings 9o are provided l'in the brake member 32 to permit the passage of air. Fan blades S2 are secured to th@ lYWheel 'to form a centrifugal fan. A shroud Sli is secured to the brake housing 55 to prevent the short circuiting of air. The .cover plate is provided with radially extending air passages 96 similar 'to the passages i813. This permits air to be ldrawn from the atmosphere tov pass through passages o8 through openings S53 through radially extending .openings 96 to `be thrown outwardly by the fan 92. Since the ian rotates continuously with the flywheel 4 the brake structure is thus vcontinuously cooled. `The bearing I is lubricated by oil .fed through the `pillow block I8 through the opening l1. The ilywheel bearings o :and B are lubricated by oil fed vthrough the pipe 1 passing through ran :axial lbore '9 formed in the shaft IE). The loil :is "thrown out by centrifugal force and passes through an opening ,Il into :an annular collecting .ring i3, vwhence it flows through duct :I5 communicating with the bore S formed in the shaft. 4A pinion Illll is secured to 'the shaft lo for rotation Ytherewith .and meshes with a gear llt-2 yof the :gear train of the press.

-It will 'be seen that we have yaccomplish-'ed `the .objects of `'our invention. AWe have provided Jan 'improved assembly of sim-plied .construction i-n which jthe brake lparts 'of a power :press brake are continuously cooled by circulating lair. We have provided -a brake lassen'oly Ifor power presses of simpliedconstruction in which the ibrake linings will automatically equalize their wear. We have Lprovided la ipowe'r vpress brake fof simple, sturdy. and vlefficient' construction, which large brak-ing forces may be employed 'without .distortion :of comparatively 'light Weight parts.

'It will be understood that l'certain features and sub-combinations are koi Autility and may lbe employed 'without reference yto other {features or `sub-corr'Ibinations. vlfhis 'is contemplated 'by and is withi'nth'eiso'pe 'of'our claim. Itis further-obvious 'that various cha'nges may be made in details within the scope of our 'claim without Ideparting 'from the spirit 'of 'our invention. It is, therefore, .to "be understood 'that our linvention 'is not to beiiimited '-1110 'me specific r details shown and described.

iI-'raving thus desoribed our invention, whatwe claim is:

:li-brake ralssemlzly `lii\.cfludin 'g 'in combination a shaft, a iframe, 'a Ybrake `housing carried Iby 'the iframe, a cover .fior the housing, an 'annular "staf tionary Vbrake plate carried within 'the housing, van annular longitudinally Amovable brake plate carried within'thfhufsing, means for preventing relative rotation "between `the brake housing and .the movable Vbrake plate, the stationary 'brake plate being formed with radially extending pas- 'sageways "said I'cover 'member being `formed with radially "extending "passa'geways `adjacent the movable brake plate, a brake disk securedto 4'the shaft for rotation threwith and positioned between the brake plates, springs positioned between the housing and the movable brake plate adapted to clamp the brake disk between the brake plates to immobilize the brake disk, means for moving the movable brake plate against the action of the springs to release the brake disk, apertures formed in the brake disk, friction blocks movably positioned in the apertures between the brakeplates, and means for continuously passing air through said radially extending passageways whereby continuously to cool the brake plates.

PHILO H. DANLY. GEORGE I. DANLY. VASIL GEORGEFF.

REFERENCES CITED The following references are of record in the file of this patent: l

UNITED STATES PATENTS Number Name Date 1,561,722 Jimerson Nov. 17, 1925 1,734,598 Schramm Nov. 5, 1929 2,095,094 Glasner Oct. 5, 1937 2,247,690 Nutt July 1, 1941 2,274,885 Brown Mar. 3, 1942 2,299,028 Nutt et al Oct. 13, 1942 2,342,750 Newell Feb. 29, 1944 

